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Issue 15, 2014
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Understanding the electrochemical mechanism of the core–shell ceria–LiZnO nanocomposite in a low temperature solid oxide fuel cell

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Abstract

Ceria based solid solutions have been considered some of the best candidates to develop intermediate/low temperature solid oxide fuel cells (IT/LT-SOFCs, 600–800 °C). However, the barrier to commercialization has not been overcome even after numerous research activities due to its inherent electronic conduction in a reducing atmosphere and inadequate ionic conductivity at low temperatures. The present work reports a new type of all-oxide nanocomposite electrolyte material based on a semiconductor, Li-doped ZnO (LixZnO), and an ionic conductor, samarium doped ceria (SDC). This electrolyte exhibits superionic conductivity (>0.1 S cm−1 over 300 °C), net-electron free and excellent electrolytic performances (400–630 mW cm−2) between 480 and 550 °C. Particularly, defects related to interfacial conduction and the intrinsic and extrinsic properties of ions are analysed. An internal or interfacial redox process on two-phase particles is suggested as a powerful methodology to overcome the internal short-circuit problem of ceria-based single phase materials and to develop new advanced materials for energy related applications. The combination of the above promising features makes the SDC–LiZnO nanocomposite a promising electrolyte for LTSOFCs.

Graphical abstract: Understanding the electrochemical mechanism of the core–shell ceria–LiZnO nanocomposite in a low temperature solid oxide fuel cell

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Publication details

The article was received on 11 Oct 2013, accepted on 19 Jan 2014 and first published on 20 Jan 2014


Article type: Paper
DOI: 10.1039/C3TA14098A
Citation: J. Mater. Chem. A, 2014,2, 5399-5407
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    Understanding the electrochemical mechanism of the core–shell ceria–LiZnO nanocomposite in a low temperature solid oxide fuel cell

    L. Fan, Y. Ma, X. Wang, M. Singh and B. Zhu, J. Mater. Chem. A, 2014, 2, 5399
    DOI: 10.1039/C3TA14098A

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